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Indebtedness - Narrative (Details)	1 Months Ended			3 Months Ended	6 Months Ended	12 Months Ended
Indebtedness - Narrative (Details)	Mar. 31, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 1997 USD ($) instrument	May 03, 2019 USD ($)	May 03, 2019 USD ($)	Oct. 31, 2018 USD ($)	May 31, 2018 USD ($)	May 04, 2018 USD ($)	Oct. 31, 2014 USD ($)	Apr. 26, 2007 USD ($)
Debt Instrument [Line Items]
Fiscal 2019 (remainder)				$ 0.0	$ 0.0
Fiscal 2020				0.0	0.0
Fiscal 2021				0.0	0.0
Fiscal 2022				215,000,000.0	215,000,000.0
Fiscal 2023				120,000,000.0	120,000,000.0
Fiscal 2024				255,000,000.0	255,000,000.0
After fiscal 2024				225,000,000.0	225,000,000.0
Long-term debt				811,079,000	811,079,000	$ 312,549,000		$ 312,302,000
Line of Credit
Debt Instrument [Line Items]
Long-term debt, gross				100,000,000	100,000,000	100,000,000		100,000,000
Debt instrument, face amount									$ 130,000,000
Debt Securities Issued In June1997
Debt Instrument [Line Items]
Debt instrument, face amount			$ 175,000,000
Coupon7.125 Percent Debt Notes
Debt Instrument [Line Items]
Debt instrument, face amount			$ 75,000,000
Debt instrument, term			10 years
Debt instrument, interest rate, stated percentage			7.125%
Senior Note
Debt Instrument [Line Items]
Long-term debt, gross				$ 0	$ 0	$ 0		91,000,000
Debt instrument, face amount										$ 125,000,000
Debt instrument, interest rate, stated percentage				6.625%	6.625%					6.625%
Debt instrument issuance price as percentage of par value										98.513%
Debt instrument, unamortized discount										$ 1,900,000
Unamortized debt issuance expense										$ 1,500,000
Debt instrument, interest rate, effective percentage				6.741%	6.741%
Debt instrument, basis spread on variable rate						0.30%
Debt instrument, repurchase offer due to change of control and downgrade of notes below an investment grade rating, percentage of principal					101.00%
6.625% senior notes
Debt Instrument [Line Items]
Long-term debt, gross				$ 123,885,000	$ 123,885,000	$ 123,854,000		123,823,000
Long-term debt			$ 100,000,000
Debt instrument, term			30 years
Debt instrument, interest rate, stated percentage			7.80%
Payment made to terminate interest rate derivatives			$ 23,700,000
Number of interest rate derivatives held \| instrument			3
Derivative, notional amount			$ 125,000,000
Deferred income earned on swap balance at termination			$ 18,700,000
Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity under credit facility		$ 600,000,000					$ 150,000,000
Line of credit facility, maximum borrowing capacity, accordion feature		300,000,000
Payments of debt issuance costs		$ 1,900,000
Long-term debt, gross				90,000,000	90,000,000	91,000,000		$ 0
Debt instrument, unused borrowing capacity, amount				508,100,000	508,100,000	507,500,000
Debt instrument, periodic payment, interest				1,800,000	1,000,000.0
Debt instrument, term		5 years
Senior Note
Debt Instrument [Line Items]
Payments of debt issuance costs	$ 600,000
Debt instrument, periodic payment, interest				1,600,000	1,600,000
Senior Note \| $200 million term loan
Debt Instrument [Line Items]
Long-term debt, gross				200,000,000	200,000,000
Debt instrument, face amount	$ 200,000,000
Debt instrument, term	3 years
Senior Note \| $300 million term loan
Debt Instrument [Line Items]
Long-term debt, gross				300,000,000	300,000,000
Debt instrument, face amount	$ 300,000,000
Debt instrument, term	5 years
Standby Letters of Credit \| Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity under credit facility		$ 10,000,000
Long-term debt				$ 1,900,000	$ 1,900,000	$ 1,500,000
Bridge Loan \| Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity under credit facility		$ 30,000,000